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US 2025/0168050 A1Published application
Method and apparatus for advanced ofdm triggering techniques
AssigneeSirius XM Radio Inc.
InventorsEdward Schell, Carl Scarpa
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Abstract
Systems and methods for a non-data-aided (NDA) approach to advanced OFDM timing are provided. This approach allows for accurate OFDM symbol timing and synchronization by avoiding inter-symbol interference (ISI) in multipath environments where an earliest arriving signal may not be the strongest signal. The NDA approach may rely on generating and applying a bias correction to a combined correlation result of the multi-path signals.
Claims20
A method for advanced wireless multi-path signal triggering, the method comprising:
- receiving, by at least one data processor, a plurality of multi-path signals that correspond to a same signal delayed by different amounts during transmission over a plurality of wireless data paths;
- generating, by the at least one data processor, a correlation result associated with the plurality of multi-path signals based on correlating the received signal of the plurality of multi-path signals with a predefined guard interval;
- determining, by the at least one data processor, a correlation midpoint associated with the correlation result;
- applying, by the at least one data processor, a bias correction over a range of data samples of the correlation result that are centered around the correlation midpoint;
- generating, by the at least one data processor, a biased correlation result responsive to the applied bias correction;
- identifying, by the at least one data processor, a peak of the biased correlation result;
- and
- using, by the at least one data processor, the peak of the biased correlation result as a triggering reference for a current data symbol of the received signal.
5 more elements
A method for advanced orthogonal frequency division multiplexing (OFDM) timing, the method comprising:
- receiving, by at least one data processor, a plurality of multi-path signals that correspond to a same signal delayed by different amounts during transmission over a plurality of wireless data paths;
- combining, by the at least one data processor, the plurality of multi-path signals into a combined signal;
- generating, by the at least one data processor, a combined correlation result for the combined signal based on a predefined guard interval;
- selecting, by the at least one data processor, a range of data samples associated with the combined correlation result based on a duration of the guard interval;
- applying, by the at least one data processor, a bias correction over the range of data samples;
- generating, by the at least one data processor, a biased correlation result responsive to the applied bias correction;
- and
- using, by the at least one data processor, a peak of the biased correlation result as a timing reference for a current OFDM symbol.
5 more elements
A system comprising:
- an orthogonal frequency division multiplexing (OFDM) receiver module comprising an antenna;
- and
- at least one computing device, wherein the at least one computing device comprises:
- at least one processor;
- memory storing computer-readable instructions that, when executed by the at least one processor, cause the computing device to:
- receive, from the OFDM receiver module, a plurality of multi-path signals that correspond to a same signal delayed by different amounts during transmission over a plurality of wireless data paths;
- generate a combined correlation result based on correlating an aggregated signal of the plurality of multi-path signals with a predefined guard interval;
- select a range of data samples associated with the combined correlation result based on occurrences of the correlation peaks;
- apply a bias correction over the range of data samples;
- generate a biased correlation result responsive to the applied bias correction;
- and
- use a peak of the biased correlation result as a timing reference for a current OFDM symbol.
9 more elements
Dependencies are inferred from the claim text.